Distributed Resource Management in Networks

1. A data communication system, comprising a network provided with a control server for managing network resources, a delivery server for delivering multimedia content to one or more UE (user equipment) devices, and a Resource and Admission Control Server, RACS, characterized in that: the control server is arranged to pass a Quality of Service (QoS) network session ID to the delivery server, said QoS network session ID being returned from the RACS in response to a resource reservation request from the control server for a Content on Demand (CoD) session between the delivery server and the UE device; the delivery server is arranged to keep track of the QoS network session ID independently of the control server, such that once the QoS network session ID has been passed to the delivery server, the control server is stateless with regard to the QoS network session, in which the delivery server is adapted to pass the QoS network session ID back to the control server upon completion of the CoD session; and the control server adapted to instruct the RACS to terminate the QoS network session upon receipt of the QoS network session ID from the delivery server.

2. A system as claimed in claim 1 , wherein the control server is adapted to pass the QoS network session ID to the delivery server during establishment of the CoD session between the delivery server and the UE.

3. A system as claimed in claim 1 , wherein the control server is adapted to pass the QoS network session ID to the delivery server from the control server.

4. A system as claimed in claim 1 wherein the control server and the UE are arranged to pass the QoS network session ID to the delivery server, via the UE.

5. A system as claimed in claim 4 , wherein the UE is adapted to pass the QoS network session ID to the delivery server using an RTSP 300 REDIRECT message.

6. A system as claimed in claim 4 wherein the UE is IPTV equipment.

7. A method of managing network resources of a network having a control server for managing network resources, a delivery server for delivering multimedia content to one or more UE (user equipment) devices and a Resource and Admission Control Server (RACS); said method characterized by passing a Quality of Service (QoS) network session ID to the delivery server, said QoS network session ID being returned from the RACS in response to a resource reservation request from the control server for a Content on Demand (CoD) session between the delivery server and the UE device; and keeping track of the QoS network session ID, independently of the control server, using the delivery server, such that once the QoS network session ID has been passed to the delivery server, the control server is stateless with regard to the QoS network session, in which upon completion of the CoD session, the delivery server passes the QoS network session ID back to the control server and the control server regains control, and upon receipt of the QoS network session ID from the delivery server, the control server instructs the RACS to terminate the QoS network session.

8. A method as claimed in claim 7 , wherein the control server passes the QoS network session ID to the delivery server during establishment of the CoD session between the delivery server and the UE.

9. A method as claimed in claim 7 , wherein the QoS network session ID is passed to the delivery server from the control server via the UE.

10. A method as claimed in claim 9 , wherein the QoS network session ID is passed to the delivery server via the UE using an RTSP 300 REDIRECT message.